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  <div class="titlepage"><div><div><h1 style="clear: both"><code>BOOST_OUTCOME_USE_STD_IN_PLACE_TYPE</code></h1></div></div></div>
  <p>How to implement <a href="../../reference/types/in_place_type_t.html" class="api-reference"><code>in_place_type_t&lt;T&gt;</code></a>
 and <code>in_place_type&lt;T&gt;</code>.</p>

<p>If set to <code>1</code>, the <code>&lt;utility&gt;</code> header is included, and <code>std::in_place_type_t&lt;T&gt;</code>
is aliased into <code>BOOST_OUTCOME_V2_NAMESPACE::in_place_type_t&lt;T&gt;</code> along with
<code>std::in_place_type&lt;T&gt;</code>.</p>

<p>If set to <code>0</code>, a local emulation is used.</p>

<p><em>Overridable</em>: Define before inclusion.</p>

<p><em>Default</em>: If the current compiler implements C++ 17 or later, if unset
this macro is defaulted to <code>1</code>, otherwise it is defaulted to <code>0</code>.</p>

<p><em>Header</em>: <code>&lt;boost/outcome/config.hpp&gt;</code></p>


        </div><p><small>Last revised: January 30, 2019 at 16:16:10 UTC</small></p>
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